Unprofessional behaviour

On 2020/10/28 I received a call from Cell C commending on the outstanding way I handle my account. Unfortunately I did not take the centre agent name. When he asked if have have got any issues I said the only issue I have is regarding my wifi contract. I explained to him that I received calls from Cell C during June and July informing my wifi, at which point I said i don't want to upgrade. The then consultant then offered me a deal 10g and 10g night for 149.00 on a month to month contract. I accepted that. when i explained it to the consultant yesterday, he said to me it is a 24 month contract. I told him that that is what was offered to me which I accepted at which he started laughing and told me I dont understand they don't have deals like that. Funny though because I actually took a screenshot from Cell C catalogue where they do offer that. I again said to him that it was a month to month contracted and again he started lauging. I got annoyed and unfortunately, (and I apologise), said to him he is F..... rude, as he phoned ME to enquire and not the other way around. He has got zero customer inclination and I will in the near future be changing my service provider. Like I said previously, Cell C have lost a long term client. I am appalled at my behaviour but even more so by his.